Improvement in clamps for sewing-machine attachments



l. G. POWELL.

Clamps for Sewing-Machine Attachments. No.l50,787. Patented May12,l874.

WITNESSES. JVENTOR.

zLZ/ZMMd Q at? UNITED STATES PATENT Orrrcn.

JOHN Gr. POWELL, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENTIN CLAMPS FORS Specification forming part of Letters PatentNoskilled in the art to make and use the same.

The nature of my invention consists in a cylindrical orconical verticalpillar or socket formed on the'attachment, and socket or pillar formedon the slotted clamp, fitting thereon loosely, so that the slotted clampmaybe placed at any angular adjustment required by the screw-holes inthe sewing-machine deck or table; and by making the pillar or socket intwo parts, one of which is formed eccentrically to the other, I cansecurely hold the attachment in any angular adjustment to the .clamp.

I will now proceed to describe the mode of making and using saidinvention, referring to the drawing annexed, and letters of referencemarked thereon.

The several figures are drawn of actual working size, and the sameletters of reference apply to the same parts in the several figures.

Figure 1 shows a plan; Fig. 2, a vertical section on the line as a; inFig. 1. Figs. 3 and 4 show a vertical section of modified form of theinvention.

Upon the attachment A (shown in Figs. 1 and 2) I place a vert-1calpillar, B. Around this pillar is placed a collar, 0, formed at the endof the slotted clamp D. The collar 0 is formed in two parts, one ofwhich is a collar,

'0, which fits in a rim or circular cavity in the clamp D. This circularcavity is made eccentric to the hole in the collar 0, and the hole inthe collar 0 is also made with equal eccentricity between the hole andthe rim. The collar 0 has a lever or handle, E, by which itEWING-MACHINE ATTACHMENTS.

. 150,787, dated May 12, 1874; application filel October I6, 1873.

maybe partly rotated in the cavity of the clamp D. When the collar 0 isso rotated as to make the hole in it coincide with the hole in thecollar 0 in the clamp D, then the clamp D will fit loosely on the pillarD. WVhen the collar 0 is rotated by the lever E so as to make the holesin the collars O and G eccentrio to each other, the clamp securely holdsin any angular adjustment in which they may be placed in the clamp D andattachment A.

In using the clamp, the collars G and O are on the pillar B of theattachment A. The attachment A- is then placed in the position in whichit is desired to be used on the sewingmachine deck, and the clamp Dplaced so that the slot coincides with a screw-hole in the deck, when itis secured by a screw and washer. The collar C is then turned so thatthe hole in it becomes eccentric to the hole in the collar U and thecollars pinch the pillar B, holding it correctly in position.

In the forms of this invention shown in Figs. 3 and 4 the pillar isformed on the clamp D, and of two parts, marked 0 and 0, one of whichparts turns upon a bearin g eccentric to both itself andthe other,and,being introduced into the socket B when concentric with each other,are easily set in any an gular adjustment desired; and one of them beingrotated by the handle E so as 'to become eccentric to the other, theattachment is held by the friction between the outer surface of theeccentric and the internal surface of the socket B.

What I claim as my invention, and desire to secure as such by LettersPatent, is-

A clamp for sewing-machine attachments, having a clamping mechanismformed with two eccentrics, as set forth and described.

JOHN G. POIVELL.

Witnesses:

WM. Koon, ANnw. J. BoswELL.

placed with the holes concentric to each other

